A painter charges $15.52 per hour, plus an additional amount for the supplies. If he made $174.03 on a job where he worked 6 hours, how much did the supplies cost?

The painter earned $15.52/hour * 6 hours = $<<15.52*6=93.12>>93.12 for his work.

So the supplies costs $174.03 - $93.12 = $<<174.03-93.12=80.91>>80.91. Answer: \boxed{80.91}.